A high-resolution grating interferometric micro-displacement sensor utilizing the subdivision interpolation technique is proposed and experimentally demonstrated. As interference laser intensity varies sinusoidally with displacement, a promising to achieve detection high resolution linearity. However, errors occur due phase imbalance, offset error, amplitude mismatch between orthogonal signals. To address these issues, circuit, along 90-degree phase-shifter high-precision DC bias-voltage...

A point-spread function (PSF) is able to describe the spatial characteristics of a remote sensing optical imaging instrument (i.e., camera). Specifically, PSF camera characterizes image quality degeneration inevitably produced by itself link, involving an system, sensor, and electronic system in process space cameras. In nonblind reconstruction applications, prerequisite for reconstructions. On-orbit measurement approaches are basically based on ground targets hidden images, such as...

This paper proposes what we believe to be a novel linearization signal conditioning circuit for tri-axial micro-grating micro-opto-electro-mechanical systems (MOEMS) accelerometer. The output of accelerometer varies as sine/cosine function the acceleration. proposed utilizes subdivision interpolation technique process these nonlinear intensity variations and render linear digital across full range. Such was achieved through 90-degree phase-shift circuit, high-precision DC bias-voltage...

We demonstrate a novel, to the best of our knowledge, micro-opto-electro-mechanical system (MOEMS) gyroscope based on Talbot effect single-layer near-field diffraction grating. The an optical grating is studied both theoretically and experimentally. A structure grating–mirror combination, fabricated by micro–nano processing method, used for out-of-plane detection. detection weak Coriolis force realized using highly sensitive displacement characteristic imaging with mirror mass block...

Laser light with spectral purity and frequency stability is pursued in precision spectroscopy measurements. We propose a scheme to generate millihertz-linewidth laser instability of 10−18 via optical four-wave mixing alkaline-earth atoms. show that the linewidth ultimately limited by natural atomic transition rather than input lasers. The depends largely on intensity It possible power 10−12 W when lasers relative 10−4 width 1 Hz interact strontium (Sr) atoms density × 1011 cm−3.

In this paper, we present the design, fabrication, and test of a micro-opto-electro-mechanical systems (MOEMS) accelerometer based on Talbot effect double-layer diffraction gratings. The detection acceleration is realized by using highly sensitive displacement characteristic imaging near-field with For purpose obtaining optimal contrast optical interferometric detection, parameters gratings are optimized finite-difference time-domain (FDTD) simulation. experimental results indicate that...

The length stability of optical cavities is vital in ultra-stable, cavity-stabilized laser systems. Using finite element analysis, we study the deviation due to thermal expansion and thermo-refractive effects when incident light power changed. simulated fractional sensitivity a 7.75-cm-long football cavity fluctuation 5×10 14/μW, which agreement with experimental results found by measuring frequency change Based on simulation, depend size material.

On the basis of self-interference effect between <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mo>±</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:math> st-order diffraction beams from a single optical submicrometer grating, we demonstrate single-detecting-path displacement sensor with high resolution. Using quadrant optoelectronic detector, system without any wave plates is realized experimentally. Combined an interpolation...

This paper proposes a subdivision interpolation technique for an optical accelerometer based on diffraction grating interferometry. The light intensity curve presents sine shape with the increase of acceleration. To address issues linearization signal processing across entire range, circuit is employed, in conjunction 90° phase shift and high-precision DC bias-voltage techniques, converting analog sinusoidal characteristics from photodetector into standard incremental digital signals that...

Abstract To meet the requirements of synchronous explosion loading large-area array in special experiments, a multi-point explosive circuit based on thin sheet detonated by mild detonating fuse is designed. The composed detonator, fuse, and booster. In this study, synchronization initiation analyzed theoretically, reliability test are carried out. results show that main factors affecting synchronicity include length deviation speed fuse. comprehensive rate 99.5%. asynchrony ranges for...

This paper proposes a straightforward method for measuring micro-displacement synchronously along two orthogonal axes. A single structure consists of pair two-dimensional gratings and quadrant detector aligned with collimated laser is used to detect the micro-displacement. The crosstalk common-mode noise are eliminated through two-step differential process. Experimental results demonstrate that displacement measurement resolution can reach 40 nm sensitivity 0.483 V/µm within linear range....

Abstract With the continuous formulation and promulgation of national policy system documents, rapid development new energy electric vehicle production manufacturing, IT informatization integration charging infrastructure industry have become a comprehensive carrier supporting information, technology services. In view interconnection different levels information data, it is bound to give full play its unique value. This paper analyzes application through informatization, interconnection,...

This paper studies the minimum thermo-tuning resolution for calibrating and steering 1-D optical phased array (OPA) through simulation experiment. Through simulation, we determined factors, including antenna pitch d, wavelength λ, calibration procedure, that affect phase tuning requirement of OPAs. Simulation results show can be reduced to 2 bits without degrading beam quality. Furthermore, an OPA with 128 antennas is implemented. Experimental validate sufficient calibrate most power...

According to the temperature measurement in medical equipment, activity of biological tissue should be achieved same environment with living human system.Aiming at application for temperature, a controller based on single-chip system is proposed realize system.The modern control theory used analyze controlling which mathematic model and state equation.The method that controls close target value changing parameter reduce error Particle Swarm Optimization (PSO).And simulation results show this...

The determination of gas concentration based on harmonic detection was studied theoretically and experimentally. principle second technology a broadband light source the impact modulation parameters signals were analyzed theoretically. principles multiple in order to improve resolution. A fiber Bragg grating bonded carbon cantilever designed achieve wavelength modulation. frequency voltage amplitude output detector random noise at different frequencies amplitudes. optimum determined be 40 Hz...

Purpose: The photon contamination is a common problem for all advanced modulated electron beam therapy techniques. scattering foil one of the major accelerator parts contributing to generation bremsstrahlung photons. This work aims characterize free (SFF) beams from Siemens Artiste and study feasibility using those breast cancer boost treatment utilizing our in‐house Monte Carlo based planning system. Methods: Percentage depth doses lateral profiles were measured available energies with...